Improvement in steel glass-cutters and knives



@eem eine THELESPHOBE SPNARD, OF COATIOOOKE, CANADA.

Leners Patent No. 111,26, dated January 24, 1871.

IMPROVEMENT IN STEEL GLASS-CUTT'ERS AND KNIVES.

The Schedule referred to in these Letters Patent and making part of thesame.

To all 'whom it may concern:

Be it known that I, IHnnnsrnonn SPNARD, of the village of Coaticooke,4in! the district of St. Francis, in theProvince of Quebec, Canada,jeweller, have invented a new and useful Steel Glass-cutter Knife and Ido hereby declare that the following is a full, clear, and exactdescription of the construction and operation of the saine, referencebeing had to the annexed drawing, i'vhere- Y Figure vI represents sideelevation of knife with cut- Jcer attached.

Figure II represents an enlarged section of knife with cutter.

Figure III represents au enlarged end view of knife with cutterattached.

The object of this invention is to produce afsteel glass-cutter inconnection with an ordinary pocketknife, and which will be simple,cheap, and effective.

In the cutting of glass a diamond is usually employed, but as thisprocess necessitates a special in-' struinent, it is frequentlyimpossible on ordinary occa-l sions for persons to avail themselves ofits use.

Steel instruments for cutting glass have also been in use, but the saineobjection as to special instruments obtains. This will be removed'byniyinvcntioin attached as it is, in a simple manner, toa commoninstrument in general use, like apocket-knife.

Thiscutting steel is arranged in the form of a small circular disk orWheel, with its outer sides beveled to a sharp cutting-edge.

A slot is provided in the metal end of the knife, into which the steelwheel is introduced, being held in place and revolving on an axlepassing through the wheel into each side of the metal.

This vcutting-wheel is made of finely-tempered steel.l

In the drawing similar letters of reference indicate correspondingparts.

a is t'he knife, of any of the ordinary forms in use; and

b, the revolving steel for cutting the glass, with beveled edges c andsharp cutting-edges (I.

e is the slot or recess cut out of the metal end fof the knife a, and pg, the axle on which the Wheel revolves.

Ihe plan of operation is as follows:

The glass to he cut is placed on a iirin level table, or bearing, and astraight-edge or other guide for the line of cutting placed in therequired position on the glass. lhe knife is then taken in the righthand and with the revolviiig steel Wheel' resting on the glass, andguided by the straight-edge, 85e., is drawn iirml y over the glass Vinthe required direction, the sharp revol ving edge of the cutter incontact with the glass, will operate like a diamond, and leave the glassin such a condition that it can be easily broken iu the line traversedby the cutter. A leading advantage possessedv by this form of cutter isthat its entire circumference acts as a cutting point, and willtherefore last much longer than the ordinary single-pointed cutter.

That I claim as mv invention and wish secured,

M.- K. STONE, EDWIN VAUGHAN

